On these pages you will find out more about how the National Transmission System (NTS) handles entry and exit capacity, including how to bid for entry capacity and apply for exit capacity. You will also be able to retrieve current and historical capacity data on these pages.

Latest capacity update


Please note that the Enduring Annual Exit (flat) capacity (EAFLEC) auction has now been processed. 

For all request results (increase & decrease), please see the Enduring Annual Increase/Decrease Application Summary reports. 


Please note that the Annual NTS (flat) Exit Capacity (AFLEC) auction has been processed.

The results of the auction can be found in the Annual Sold/Unsold Quantity report.


Please note that the Long Term Exit application window will open on 1st July 2022. This window will consist of:

  • Enduring annual exit (flat) capacity increase (EAFLEC) – for enduring capacity commencing from Y+4 to Y+6
  • Enduring annual exit (flat) capacity decrease (EAFLEC) – allowing users to reduce capacity from Y+1
  • Annual NTS (flat) exit capacity (AFLEC) – for capacity covering Y+1 to Y+3

For more information, please refer to our Gas Transmission Capacity Guidelines document.


Please note that Interim Bid Window 1 has now closed for the 2022 Quarterly System Entry Capacity (QSEC) auction. 

The results of the auction can be viewed here. Interim Bid Window 2 opens at 08:00 on Tuesday 15th March 2022. 


Please note that the 2022 Quarterly System Entry Capacity (QSEC) auction will open on Monday 14th March 2022 at 08:00. 

For more information, please view our QSEC Presentation pack.


Please note that the 2022Annual Monthly System Entry Capacity (AMSEC) auction has now officially closed.

The results for all four tranches can be viewed by clicking here.


Please note that the 2022 Annual Monthly System Entry Capacity (AMSEC) auction will open on Monday 14th February 2022. It will consist of 4 tranches, which will take place on the following dates:

  • Monday 14th February 2022
  • Thursday 17th February 2022
  • Tuesday 22nd February 2022
  • Friday 25th February 2022

Please refer to the 2022 AMSEC invitation letter for further detail. 



Gemini contingency arrangements

Here you will find guidance on the Gemini Code contingency arrangements should a failure of the Gemini system occur. The processes detailed on here should only be followed when we have declared a Code contingency.

When contingency arrangements are being used, news updates will be provided via the standard communications channels:

For Gemini training materials and operational processes, please go to the Xoserve website. You can find more about Gemini contingency on the Joint Office Website.

Processes to be followed and proforma to be used in the event of a Gemini Code contingency are located here:

Download the Gemini Code Contingency Guidelines document



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To find out more about charges and how those charges are determined, please refer to the Charging pages.

Find out more